cooling on an AGU

[tommymac]

will do mate, im going to get the one which opens at 82 for safety reasons!

[tommymac]

eh so there is no stat that opens at 82! gay,

anyway something is very wrong here! there most be a huge airlock somewhere the only thing that i can think of is my cooling is not plumbed in the same as OEM AGU's for example nipple on the radiator is not flowing back to my bottom rad hose its T'd into the return on the hoses to the expansion tank would that be an issue?

[Golf Loon]

I did research when I put the AEB into the Rocco. I looked at all the build threads I could find on the interweb and how the cooling plumbing was in each picture. That helped me lots and I basically made the closest approximation I could with that engine and car configuration.

Here are a couple I nicked from qpeng for you.

http://www.qpeng.com/images/guide/IMG_1614.sized.jpg

http://www.qpeng.com/images/guide/IMG_1623.sized.jpg

http://www.qpeng.com/images/guide/IMG_1616.sized.jpg

http://www.qpeng.com/images/guide/IMG_1607.sized.jpg

[tommymac]

yer i need to find someone with an AGU cos I have no clue what is going on ere

[Jmac]

Mate show us u pic of the set up, i know you probably wnat to keep the car low key at this stage, but a pic of your cooling set up might help us champ. Have you tried running it with the stat out??? i know its not the greatest idea in the long term from a fuelling point of view but just to see how it circulates. Mate email a pic if you like
Jmac

[tommymac]

yer fair enough ill have to grab you a all a pic but yer man there is some odd **** going on here, I bypassed the H.C and it felt like it was filling up more but still no luck! the cluster read 105 degrees and i bricked it I know the lines are correct as i followed a flow diagram but it just isnt flowing!! The only clue I got today was that I used after market screws to hold the rad in place and when one of them was out coolant was pissing out of it. I'm talking about the little black lug holes there are 4 on each side of the rad so unless the screws are blocking flow im about the go *****g mental.

[Peter Jones]

Where is the highest point in the top hose? At the block or at the radiator?

The small diameter (8mm) return line to the coolant tank needs to be tapped off the highest point to bleed the air out of the system.

In the MK3 onwards motors it was taken from the block outlet, in the MK 1s it comes off the radiator nipple.

You might need to do someting like I did and tap into the top hose directly using a temp sender adaptor. In my case I was using a MK3 1800 with it's original raditor but because the radiator got mounted higher I was getting air trapped in the top hose.

If you have to make something up, just be careful, the barb that comes off the MK1 radiator for this hose is restricted internally, you'll need to make a similar restiction in your setup.

I used a brass 8mm barb and soldered it closed. I then drilled a hole through the solder the match the diameter of the ID of the MK1 barb, about 3mm if memory serves.



Pete

[Peter Jones]

OK upon re-reading, you're running a MK2 radiator upside down in a MK2?

The 8mm nipple will be at the bottom of the radiator then, your water pump may just be sucking air from the coolant bottle if you're still hooked up that way.

Where is the small hose to the coolant resevoir connected to?


Pete

[tommymac]

peter,

hows it going mate?

well the highest point is the cylinder head my top hose sits below the cylinder head and sort of slops up at a shallow angle as it reaches the top rad inlet, now my rad is upside down so the nipple on the rad is racing up pointing at the drivers QP. now maybe this is all becuase its upside down! I dont know basically on my motor there is are 2 lines which return to the expansion tank one is tapped in the top hose from the factory and the other is from the rad nipple which as I said is at the top of the rad now, obviously it would have been at the bottom in the OEM mk2 set up, i wonder if this is causing an issue?

[h100vw]

Maybe try filling it up through the top hose?

Gavin